XPost: sci.electronics.basics
On Sun, 20 Nov 2011 07:33:02 -0500, "Arny Krueger" wrote:
>
>"Don Pearce" wrote in message
>news:4ec8970f.348225@news.eternal-september.org...
>> On Sat, 19 Nov 2011 18:05:11 -0600, "krw@att.bizzzzzzzzzzzz"
>> wrote:
>>
>>>On Sat, 19 Nov 2011 18:23:36 GMT, spam@spam.com (Don Pearce) wrote:
>>>
>>>>On Sat, 19 Nov 2011 12:17:35 -0600, "krw@att.bizzzzzzzzzzzz"
>>>> wrote:
>>>>
>>>>>On Sat, 19 Nov 2011 10:16:43 GMT, spam@spam.com (Don Pearce) wrote:
>>>>>
>>>>>>On Sat, 19 Nov 2011 20:22:43 +1100, "Trevor" wrote:
>>>>>>
>>>>>>>
>>>>>>>"Don Pearce" wrote in message
>>>>>>>news:4ec76c21.174471@news.eternal-september.org...
>>>>>>>> On Fri, 18 Nov 2011 13:51:37 -0800 (PST), RichD
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>>What's the difference between reverb, echo, and feedback?
>>>>>>>>
>>>>>>>> Echo is a single reflection of a sound - the kind you hear when you
>>>>>>>> shout "Hello" near a cliff.
>>>>>>>
>>>>>>>Multiple reflections are also common in such instances.
>>>>>>>
>>>>>>
>>>>>>No they are not. One cliff, one echo. No choice.
>>>>>
>>>>>Two walls of said cliff; multiple echoes. If you're on the edge of the
>>>>>cliff
>>>>>with no opposing wall there will be zero echo.
>>>>>
>>>>Since when does one cliff have two walls? The cliff IS the wall.
>>>
>>>Zero intelligence.
>>>
>>>>>>>> Feedback is a situation you only get when you have an amplifier and
>>>>>>>> a
>>>>>>>> speaker. The sound arriving from the speaker is a little louder than
>>>>>>>> the one that originally hit the microphone, so that comes out of the
>>>>>>>> speaker a little louder still. This loop will build until the system
>>>>>>>> howls.
>>>>>>>
>>>>>>>That would be *acoustic feedback* only, There are MANY other types of
>>>>>>>course.
>>>>>>>
>>>>>>In the context of the question it would simply be confusing to discuss
>>>>>>- or even mention - other kinds.
>>>>>>>
>>>>>>>>You cure it by turning down the amplifier so the sound from the
>>>>>>>> speaker is always a little softer than the original when it hits the
>>>>>>>> microphone.
>>>>>>>
>>>>>>>Or any other method that reduces the loop gain at the feedback
>>>>>>>frequency,
>>>>>>>notch filtering being a common example.
>>>>>>>
>>>>>>
>>>>>>Again, given the question, no need to complicate the answer.
>>>>>
>>>>>But you found it necessary to bring up loop gain. Interesting. You
>>>>>wouldn't
>>>>>be an audiophool, by chance?
>>>>
>>>>Loop gain greater than unity is what causes feedback howl. There is no
>>>>way of avoiding it if you want to explain what causes the feedback.
>>>
>>>Wrong. *Regenerative* feedback needs a gain > unity.
>>>
>>>>And make no mistake, the feedback the OP was asking about was the loud
>>>>howl you get when you turn the PA up too far.
>>>
>>>You can't even keep *your* terms straight. You *must* be an audiophool
>>>(lack
>>>of an answer speaks volumes).
>>
>> I leave the verdict to the audience.
>
>There is no doubt that your answer was correct, Don.
He's illiterate.
>KRW's response was one of those hard-to-understand pronouncements of "you
>are wrong" followed by a recitation of the same identical facts. Since his
>facts agree with you, his pronouncement that you were wrong is itself wrong.
He is absolutely wrong. He can't even follow his own definitions.
>Obviously, he's not watching very closely.
You audiophools are some piece of work.
>There was a rush to judgment.
>
>He owes you an apology.
Absolutely wrong.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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